A method for wireless transmission of acoustic cardiac signals during a medical imaging examination is provided. The acoustic cardiac signals are acquired at a sampling frequency using an optical microphone, and the sampling frequency spans one period duration. The wireless transmission of the acoustic cardiac signals is accomplished by a transmission device that includes a controller and a transmission unit. The transmission unit includes a signal modulation unit including a transmit diode and a receive diode. The method includes activating the transmit diode using the controller for a time interval including the activation time. The activation time is less than a period duration. The method includes emitting a signal using the transmit diode during the activation time. The emitted signal is optically modulated based on the acoustic cardiac signals. The method also includes acquiring the modulated signals using the receive diode during the activation time, and wirelessly transmitting the signals.
